Section 2 in The Central Electricity Authority (Technical Standards for Connectivity to the Grid) Regulations, 2007
2. Definitions.
- In these regulations, unless the context otherwise requires,-(1)"Act" means The Electricity Act, 2003 (No. 36 of 2003);(2)"Appropriate Load Despatch Centre" means the National Load Despatch Centre (NLDC), Regional Load Despatch Centre (RLDC) or State Load Despatch Centre (SLDC) or Area Load Despatch Centre as the case may be;(3)"Area Load Despatch Centre" means the centre as established by the state for load despatch and control in a particular area of the state;(4)"Appropriate Transmission Utility" means the Central Transmission Utility or State Transmission Utility as the case may(5)"Automatic Generation Control" (AGC) means capability to regulate the power output of selectable units in response to total power plant output, tie-line power flow, and power system frequency;(6)"Automatic Voltage Regulator" (AVR) means a continuously acting automatic excitation control system to regulate a generating unit terminal voltage;(7)"British Standards" (BS) means those standards and specifications approved by the British Standards Institution;(8)"Bulk consumer" means a consumer who avails supply at voltage of 33 kV or. above;(9)"Earth Fault Factor" at a location in a three-phase system means the ratio of 'the highest root mean square (r.m.s.) phase-to-earth power frequency voltage on a sound phase during a fault to earth (affecting one or more phases)' to 'the r.m.s. phase-to-earth power frequency voltage which would be obtained at the selected location without the fault';(10)"Earthing" means connection between conducting parts and general mass of earth by an earthing device;(11)"Energy Management System" (EMS) means a complete system comprising software for facilitating operation of a power system, maintaining safety, reliability and economy;(12)"Event Logging Facilities" means a device provided to record the chronological sequence of operations of the relays and other equipment;(13)"Frequency" means the number of alternating cycles per second [expressed in Hertz (Hz)];(14)"Generating Unit" means an electrical Generator coupled to a prime mover within a Power Station together with all Plant and Apparatus at that Power Station (up to the Connection Point) which relates exclusively to the operation of that generator; -(15)"IEC Standard" means a standard approved by the International Electro technical Commission;(16)"Indian Standards" (IS) means standards specified by Bureau of Indian Standards;(17)" Interconnection point" means a sub-station or switchyard at which point the interconnection is established between the requester and the grid;(18)"Isolator" means a device for achieving isolation of one part of an electrical system from the rest of the system;(19)"Maximum Continuous Rating" (MCR) of a generating u$it means the maximum continuous output in MW at the generator terminals guaranteed by the manufacturer at rated parameters;(20)"New Unit" means a generating emit for which the requester is seeking connection to the grid;(21)"Power Factor" means the cosine of the electrical angle between the voltage and current complexors in an AC electrical circuit;(22)"Power System Stabilizer" (PSS) means controlling equipment which receives input signals of speed, frequency and power to control the excitation via the voltage regulator for damping power oscillations of a synchronous machine;(23)"Protection System" means the equipment by which abnormal conditions in the grid are detected and fault clearance, actuating signals or indications a*e initiated without the intervention by the operator;(24)"Reactive Power" means in relation to an AC electrical system, the product of root mean square (r.m.s.) voltage, root mean square (r.m.s.) current and the sine of the electrical phase angle between the voltage complexor and current complexor, measured in volt-amperes reactive (VAr);(25)"Requester" means a person such as a Generating Company including captive generating plant or Transmission Licensee (excluding Central Transmission Utility and State Transmission Utility) or Distribution Licensee or Bulk Consumer, who is seeking connection of his new or expanded electrical plant to the Grid at voltage level 33 kV and above;(26)"SCADA" means Supervisory Control and Data Acquisition System that acquires data from remote locations over communication links and processes it at centralised control location for monitoring, supervision, control as well as decision support;(27)"Site Common Drawing" means a drawing prepared for a connection site, which depicts layout of connection site, electrical layout, common protection and control drawings and common services;(28)"Site Responsibility Schedule" (SRS) means a Schedule for demarcating the ownership, responsibility for control, operation and maintenance of the equipment at the interconnection point;(29)"System Protection Scheme" means a scheme designed to detect abnormal system conditions and take predetermined, corrective action to preserve system integrity and provide acceptable system performance;(30)"Thermal Generating Unit" means a generating unit using fossil fuels such as coal, lignite, gaseous and liquid fuel;(31)"Total Harmonic Distortion" (THD) means a measure of distortion of the voltage or current wave form (which shall ideally be sinusoidal) and is the square root of the sum of squares of all voltage or current harmonics expressed as a percentage of the magnitude of the fundamental;(32)"Transmission System" means a network of transmission lines and sub-stations;(33)"Under Frequency Relay" means a relay which operates when the system frequency falls below a pre-set value;(34)"User" means a person such as a Generating Company including captive generating plant or Transmission Licensee (other than the Central Transmission Utility and State Transmission Utility) or Distribution Licensee or Bulk Consumer, whose electrical plant is connected to the grid at voltage level 33 kV and above; and(35)"Voltage Unbalance" means the deviation between highest and lowest line voltage divided by Average Line Voltage of the three phases.The words and expressions used and not defined in these regulations but defined in the Act shall have the meanings assigned to them in the Act.
